Holder for crystal detectors.



1.1, GHEGAN.

HOLDER FUR CRYSTAL DETECTORS.

APPUCATION wm JUNE lo, 1915.

L11. @g' @wanted Dec. Y, 1915 qlm JOHN J. GHEGAN, OF EAST ORANGE, NEW JERSEY.

HOLDER FOR CRYSTAL DETECTORS.

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Beit known that l, Joux J. GIIEGAN, a citizen of the United States, residing in East Orange, in the county` of Essex and State of New Jersey, have inade certain new and useful Improvements in Holders for Crystal Detectors, of which the following is a specification.

This invention relates to receiving appa ratus employed in radio or wireless telegraphy, and involves the use of a crystal, including in that term cerusite, carborundum, silicon and any and all of the general class of minerals and other substances used for detectors in wireless receiving apparatus employed in rendering oscillations audible.

'lhe object of the invention is to provide a detector with its complementary contact,

usually a point which is spring-actuated and whose point of engagement with the crystal may and must be varied occasionally.

rlhe improvement consists in providing a holder having a universal joint, like a ball and socket joint, operated under frictional pressure, by which means it is retainedl in any set position, and combining with this a pivoted lever and a frictional retaining device for the lever. The combination of the two forms of joints in the support for the complementary contact greatly facilitates the easy movement of the contact from one Contact position to another, while retaining any Contact position uninterruptedly. 4F or the purpose of supporting the crystal, 1 provide a clip, the jaws of which are spring pressed toward each other; this facilitates the substitution of one crystal for another, and permits the shifting of the surface presented ;tor engagement with the complemen tary contact. t

The accompanying drawing illustrates the invention.

Figure 1 is a top Dian view of the complete holder. Fig. 2 is a side elevation. Fig. 3 is an end elevation and Fig. 4 shows the two arms and the contact in detail.

libere is a base of insulating material 10. On this base is supported two springs constituting a spring clin Z). The two springs constituting the clip are shown at 11 and 12 and are fastened to the base 10 through the medium of the binding post 14; the free ends of clip foi-ined of the springs l1, 12, are' curved to receive the crystal c which may be cai-horundum; there is a complementary contact d, preferably bent or curved as Specification of Letters Patent.

Application filed June 10, 1915.

Patented Dee. Y, il E115. 'seriai No. 33,247.

shown in Fig. 2, and supported in a pivoted` arm 711,' at the terminal 1T of arm m, there is a saw cut and the wire (l is introduced in this cut and retained by a set-screw Arm m is pivoted to anv arm a at 21, and the hinge joint thus formed is under frictional restraint by means of a plate spring s, see Fig. 4, located between the two arms at the hinged junction; on the free terminal of arin m is a knob /c of insulating material for the convenient"movement ot the supi port. The arm u, is on a universal joint, like a ball and socket joint. The ball is shown at c. There are two springs 18 and 19 united at 31; spring 1S is bent at right angles and perforated; it is supported through the medium of the screw post 13 which fastens it to the base l0. The ball e engages a perforation 32 in spring 18 on one side and a perforation 20 in spring' 19 on its under side. Springs 18 and 19 are pressed toward each other and apply friction to ball e, so that in whatever position the arin ci may be placed, it is retained. In F ig. 2, the dotted lines show arm m tilted, so as to elevate the wire d, and in Fig. 3 arm a is shown in a tilted position, as represented in full outline in Fig. 2.

ln operation, the hand is applied to the knob and the contact point of wire d is easily applied to and retained in any position of contact with respect to the exposed. surface of the crystal c.

What ll claim is:

1. In a detector, the combination of 'an electrode, a holder therefor, a complementary contact, a support therefor consisting of a universal joint, and twoineinbers hinged together, one of said members directly conn nected to said complementary contact, the other to said joint.

2. ln a, detector, the combination of an electrode, a holder therefor, a coinpleinentary contact, a support therefor consisting of a universal joint, two members hinged to gether, one of said members directly con iiected to said complementary contact, the other to said joint, and means for friction,-

ally restraining the movement of eitherv member. j

3.111 a detector, the combination of a solid member, a holder therefor; a resilient complementary contact, a universal joint, means for retaining it in set position and a. support therefor consisting of two inem bers hinged together, one of said men'ibias directly connected to said universal joint, the other member directly connected to said complementary Contact. 4. In n detector, the combination of an 5 electrode, a holder therefor in the form of a spring clip, a complementary Contact, :i uni- Versal joint supporting said Contact, a member connected to said Contact at one end and a hinge connecting said member and said 10 joint. l

5. In a, detector, the combination of an electrode and a. complementary contnct, n universal joint to which said Contact is connected, and a hinge connection between said Contact and joint.

JOHN J. GHEGAN.

Witnesses z WILLrAM MARSHALL, Gno. HELLER. 

